package com.gopay.bis.common.util;

import java.security.Key;
import java.security.KeyFactory;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * RSA加密类
 * 
 * @RSAEncoder.java
 * @author zhanghongbo
 * @2012-4-19 下午05:22:30 www.gopay.com.cn Inc.All rights reserved.
 */
@SuppressWarnings("restriction")
public class RSAEncoderUtil {

    private static Log logger = LogFactory.getLog(RSAEncoderUtil.class);

    private static final String KEY_ALGORITHM = "RSA";
    private static byte[] publicKey;
    private static byte[] privateKey;

    static {
        try {
            publicKey = new BASE64Decoder().decodeBuffer(GetKeyProperties.getValueBykey("public_key_store"));
            privateKey = new BASE64Decoder().decodeBuffer(GetKeyProperties.getValueBykey("private_key_store"));
        } catch (Exception e) {
            logger.error("初始化密钥异常", e);
        }
    }

    /**
     * 加密<br>
     * 用公钥加密
     * 
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {
        // 对公钥解密
        // byte[] keyBytes = decryptBASE64(key);

        // 取得公钥
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicKey = keyFactory.generatePublic(x509KeySpec);

        // 对数据加密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);

        return cipher.doFinal(data);
    }

    /**
     * 加密<br>
     * 用公钥加密
     * 
     * @param data
     * @return
     * @throws Exception
     */
    public static String sign(String data) throws Exception {
        byte[] tempdata = encryptByPublicKey(data.getBytes(), publicKey);
        String tempStrDate = (new BASE64Encoder()).encodeBuffer(tempdata);
        return tempStrDate;
    }

    /**
     * 解密<br>
     * 用私钥解密
     * 
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {
        // 对密钥解密
        // byte[] keyBytes = decryptBASE64(key);

        // 取得私钥
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

        // 对数据解密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, privateKey);

        return cipher.doFinal(data);
    }

    /**
     * 解密<br>
     * 用私钥解密
     * 
     * @param data
     *            铭文
     * @param key
     * @return
     * @throws Exception
     */
    public static String decryptByPrivateKey(String sign) throws Exception {
        byte[] decodeBuffer = new BASE64Decoder().decodeBuffer(sign);
        byte[] tempdata = decryptByPrivateKey(decodeBuffer, privateKey);
        return new String(tempdata);
    }

    /**
     * 验证秘文是否与铭文一致
     * 
     * @param plainData
     *            明文
     * @param ciphData
     *            秘文
     * @return
     */
    public static boolean verify(String plainData, String sign) throws Exception {
        boolean flag = false;
        String databyDecrpt = decryptByPrivateKey(sign);
        flag = plainData.equals(databyDecrpt) ? true : false;
        return flag;
    }

    public static void main(String[] args) {
        String s = "wahaha|9.90|刘俱扬||";
        try {
            System.out.println(sign("BOC100000000001368|6228"));
            System.out
                    .println(verify(
                            "BOC100000000001368|6228",
                            "VYCIhlEHCeJ3AIlbJPueA2AqE89i0KL64PZAPtCGQKQtWjsrfHkaIWzaLqIzd4A5kAcH+svf/QitqtedsUtGAnBLdTL3g5YSCXJGLxMoLkvRmPy6JSxYnvGkj/4wsMJeGQPQs27jk6e/vM/XODRCCfqZRFHzHruiVIEgeXEgAgc="));
            String encryptByPublicKey = sign(s);
            logger.info(encryptByPublicKey);
            verify(s,
                    "O+U5gWhYNSaPka/9ppdvI1p/2pWiaA0soDnQDygGVzhc3rD0RuarVai6zM+dCG2vxPxnGftLreD00ZsbVXvXfWNBNEqT6GVTKI/8Zbf47KoGXnUA65NTxUeh8vxmQe3KMj1+JoUWjHWGkl7O8ZGrsirqfnXV4mUaGqDH2lxeNZ4=");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
